Expansion shield



Oct. 13, 1925.

c. c. TOMKINSON EXPANSION SHIELD Filed Oct. 1, 1921 awuem boz Czar/e5 6. imk/mswz A Q-btommg Patented Get. 13, 1925.

UNITED STATES 1,557,119, PATENT OFFICE.

CHARLES C. TQMKINSON, OF PLAINFIELD, NEW JERSEY, ASSIGNOR TO J. EDWARD OGDEN, 0F MO'UNTAINVILLE, NEW YORK.

EXIE'ANSION SHIELD.

Application filed October... 1, 1921.

To all whom it may concern.

Be it known that I, CHARLES C. Teamm- SON, a citizen of the United States, and a resident of Plainfield, county of Union and State of New Jersey, have invented certain new and useful Improvements in Expansion Shields, of which the following is a specification.

This invention relates to expansion shields for bolt anchors such as are used for anchoring belts in walls of brick, stone or cementitious material.

One of the objects of the invention is to providev a simple, practical and inexpensive expansion shield and a method of making such a shield.

Further objects of the invention will ap pear as the description proceeds.

The objects of the invention are attained in the embodiments of the invention illustrated by first forming a sheet metal blank,

' preferably by stamping, the blank having substantially parallel sides or edges and the edges, in the particular embodiintnt of the .invention illustrated, having oppositely disposed or laterally alined notches formed therein adjacent their ends. The shield is formed by folding the blank upon itself about its central portion and then folding the edges inwardly until they meet forming a tubular member. If desired the blank may be formed with a substantiallycircular blank from which the shield may be made.

Fig. 3 is an elevation of the shield formed from the blank shown in Fig. 2.

Fig. 4: is an end elevation of the construction shown in Fig. 3 looking at the closed or cupped end of the shield.

Fig. 5 is a plan view of another form of blank from which the shield ma be made.

Fig. 6 is a plan view of still another form of blank.

Serial No. 504,829.

Fig. 7 is an elevation of a shield formed from the blank shown in Fig. 6, and

Fig. 8 is a plan view of still another form of blank.

In the construction shown in Figs. 2, 3 and 4, the blank is formed with a substantially circular central portion 10 and laterally extending portions 11 and 12. The laterally extending portions 11 and 19. have their side edges notched adjacent their ends as shown at 13, and it will be noted that these notches are oppositely disposed or laterally alined.

The next step in the method of making the shield is to fold the blank upon itself about its central portion and to fold the edges 11 and 12 inwardly toward each other until they meet thereby forming a tubular shield. This step forms a cup shaped shield and if desired the blank may be drawn as well as folded, this step being determined by the initial size of the blank and the desired size of the shield. From the showing in Fig. 3 it will be seen that the notches 18 will register when the blank is folded thereby forming V-shaped, or triangular shaped openings in the shield at the meeting edges of the ends of the shield. After the shield has been formed the closed end maybe punched out to form an opening for receiving the belt or if desired this portion may be punched out from the blank before the blank is folded.

In order to expand the shield shown in Fig. 3 a nut is used having triangular or Vshaped projecting portions at diametrically opposite points on its outer surface. These portions being positioned in the triangular shaped openings in the shield will act as wedges when the nut is moved longitudinally with respect to the shield and will spread the shield laterally into engagement with the wall of the opening in which the anchor is inserted.

In Fig. 5 another embodiment of the invention is illustrated and in this form the blank has a central apertured portion 14: which is considerably smaller or of less width than the remaining portions of the blank. The shield is formed from the blank shown in Fig. 5 in substantially the same manner as that already described, the end portions being folded about the central por tion and the edges then being folded inwardly until they meet.

In Fig. 6 another form of blank is shown and in this form the side edges are sub stantially parallel throughout their length and the notches 13 are formed as before. The shield formed from this blank by the method already described is shown in Fig. 7.

In Fig. 8 a blank is shown from which a shield may be formed having a deeper cup, or in other words, a longer shield than is formed from the other blanks shown. In making a shield from the blank shown in Fig. 8 the blank may be drawn as it is folded.

Although certain specific embodiments of the invention have been illustrated and described, it is obvious that still further embodiments may occur to those skilled in the art and it is my intention, therefore, to cover in the following claims any such changes in the method of making my improved expansion shield or in the article itself.

lVhat I claim is:

1. A method of forming an expansion shield from a single piece elongated sheet metal blank which consists of forming a blank with notches in its side edges adjacent the ends, bending the blank upon itself on an axis transverse to the length thereof and folding the lateral edges around a nut having projections extending into the notches and inwardly toward each other until they meet, to form a tubular shield.

2. A method of forming an expension shield from a single piece elongated sheet metal blank which consists of forming a blank with opposite, transversely alined, notches at each end, bending the blank upon itself on an axis transverse to the length thereof and folding the lateral edges around a nut having projections extending into the notches and inwardly until they meet forming a tubular shield.

edges having oppositely disposed notches therein adjacent the ends of the blank remote from the central portion thereof, bending the laterally extending portions at right angles about the central portion, cupping the central portion and bending the edges inwardly until they meet to form a circumferentially closed tube.

4. A method of forming an expansion shield from a single piece sheet metal blank which consists of forming a blank with an enlarged central portion and with portions extending laterally from the central portion having substantially parallel edges having oppositely disposed notches therein, bending the laterally extending portions at right angles about the central portion and bending the edges inwardly until they meet to form a tube, said shield being bent around an expanding element having projections adapted to be received by said notches.

5. A method of forming an expansion shield from a single piece sheet metal blank which consists of forming a blank with a substantially circular apertured central portion and with portions extending laterally from the central portion having substantially parallel edges, bending the laterally extending portions at right angles about the central portion, cupping the central portion, and bending the edges inwardly until they meet to form a tube.

6. A one piece, folded, tubular, sheet metal, shield having one end cup shaped and apertured to receive a bolt and having its other end open, said shield having registering notches in the meeting edges forming triangular openings therein.

7. In combination, a one piece folde d sheet metal shield having one end cup shaped and apertured to receive a bolt and having its other end open, said shield having the'registering notches in its meeting edges and an expanding element in the shield having projections extending into said notches.

In witness whereof, I have hereunto set my hand this 30th day of September, 1921.

CHARLES C. TOMKINSON. 

